EP2389854B1 - Device and method for a dishwasher - Google Patents

Device and method for a dishwasher Download PDF

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Publication number
EP2389854B1
EP2389854B1 EP10005384.2A EP10005384A EP2389854B1 EP 2389854 B1 EP2389854 B1 EP 2389854B1 EP 10005384 A EP10005384 A EP 10005384A EP 2389854 B1 EP2389854 B1 EP 2389854B1
Authority
EP
European Patent Office
Prior art keywords
air
bed
fan
container
drying material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10005384.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2389854A1 (en
Inventor
Giuseppe Dreossi
Bernd Krische
Anders Haegermarck
Petter Svanbom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to PL10005384T priority Critical patent/PL2389854T3/pl
Priority to EP10005384.2A priority patent/EP2389854B1/en
Priority to US13/699,236 priority patent/US9492057B2/en
Priority to PCT/EP2011/057798 priority patent/WO2011147700A1/en
Priority to CN201180025319.4A priority patent/CN102905603B/zh
Publication of EP2389854A1 publication Critical patent/EP2389854A1/en
Application granted granted Critical
Publication of EP2389854B1 publication Critical patent/EP2389854B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/48—Drying arrangements
    • A47L15/481—Drying arrangements by using water absorbent materials, e.g. Zeolith
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/48—Drying arrangements
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0042—Desorption phases of reversibly dehydrogenated drying material, e.g. zeolite in a sorption drying system
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0052—Noise reduction
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/48—Drying arrangements
    • A47L15/486—Blower arrangements
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/03—Operation mode, e.g. delicate washing, economy washing, reduced time, sterilizing, water softener regenerating, odor eliminating or service
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/12—Air blowers

Definitions

  • the operation of a conventional dishwasher generally comprises a washing program of processes performed sequentially, such as e.g. a "prewash” step followed by a “clean” wash step, an "intermediate” wash step, and a “clear” wash step, or the like.
  • a dishwashing machine comprising a washing container, a heating device and a sorption drying device.
  • the sorption drying device in the disclosure comprises a reversibly dehydratable material that acts as an adsorbent of moisture from air during the passage of air through the sorption drying device.
  • air that passes through the sorption drying device may be dried by the dehydratable material, such that washed crockery, comprised in the washing machine, may be dried.
  • a fan For generating an air flow when the sorption drying device is in use, a fan is provided. Furthermore, a heating device is arranged in the region of the vicinity of the air inlet of the sorption column, such that the air which is to pass the dehydratable material is heated at the input of the sorption column.
  • the device of the present invention is arranged for fluid communication with a washing chamber of a dish washer.
  • fluid communication it is here meant that a fluid such as e.g. air with varying amounts of moisture may pass between the device and the washing chamber, and vice versa, of the dish washer, i.e. that the device allows a passage of air between the device and the washing chamber, as well as between the washing chamber and the device.
  • the humidity of the air before passing the drying material is higher than the humidity of the air after passing the drying material, in the withdrawal step.
  • the drying material acts as a "dryer" of the air, and may bind some of the moisture of the passing air.
  • the air passing the drying material during the withdrawal step is heated by the heat of adsorption.
  • the humid air, before passing the drying material has a lower temperature than the temperature of the dryer air after passing the drying material. This increase of temperature is advantageous as additional heating of the air that is to enter into the washing chamber may possibly not be necessary. Furthermore, the heated air may more easily take up moisture from the goods before reentering into the device.
  • the drying material is able to release moisture to the air during a regeneration step, when the device is in use. Contrary to the withdrawal step, air from the washing chamber of the dish washer, before applying the regeneration step, may be relatively dry. Thus, the drying material may be at least partially regenerated by releasing the moisture (i.e. water), which is associated with the drying material, to the air. In other words, the drying material may release the moisture to the air, such that the air in the washing chamber becomes more humid.
  • the moisture i.e. water
  • the humidity of the air after passing the drying material is higher than the humidity of the air before passing the drying material.
  • the drying material may release the moisture or water which is bound in the material, to the passing air.
  • a heating element is arranged in the bed, wherein the heating element is arranged to heat the drying material during the regeneration step when the device is in use such that moisture is released from the drying material.
  • heating element may be construed as any heat-producing unit, cell, radiator, or the like, known to the man skilled in the art.
  • a thin-film heater could be a possible heating element.
  • the fan may circulate the air such that the goods comprised in the washing are heated and humidified by the hot, humid air from the drying material, i.e. in the cycle generated by the fan, the drying material increases the amount of humidity in the washing chamber.
  • fan it is in this context meant e.g. a propeller, a turbine, or pumping device, such that an air flow is generated when the device is in use.
  • the fan speed is set such that the air passes the device at a certain flow rate.
  • the time of the cycle for the air passage from the washing chamber of the dish washer, to the device, and back to the dish washer is a function of the flow rate of the withdrawal step.
  • the fan speed may be such that the flow rate is not zero, i.e. that an air flow is generated and that moisture is released from the drying material to the passing air.
  • the fan speed may be such that the flow rate is zero during the regeneration step.
  • the drying material may still regenerate such that moisture is released from the drying material to the air.
  • the device and method of the present invention contributes to a decrease of energy use. This is beneficial not only for environmental aspects, but also for the economics regarding the operation of the dish washer.
  • the lower fan speed of the regeneration step may give a more quiet operation of the device, i.e. a noise reduction when the dish washer is in use.
  • dish washers often are present in kitchens, in which people often spend much time for e.g. preparing meals and eating.
  • a more silent dish washer contributes to a more pleasant and agreeable kitchen environment.
  • An option of a substantially constant speed of the fan during the regeneration step may avoid noise disturbances in relation to varying fan speeds. Furthermore, as the magnitude of a rotating operation, such as the rotation of a fan, often is directly related to noise, the lower fan speed of the regeneration step yields a more quiet operation of the device, i.e. a noise reduction when the dish washer is in use.
  • the Mica mineral has extremely low thermal conductivity, which makes the material especially suitable for the high-temperature conditions within the container during operation, as the material mitigates the conduction of heat to the exterior.
  • the Mica mineral is refractory enough to withstand temperatures as high as 1200° C.
  • the resistance to heat of the Mica mineral is highly advantageous for the application in dish washers, or the like, wherein the high temperatures may be detrimental for other material used.
  • the container may be shaped as a parallelepiped and the housing as a somewhat bigger parallelepiped, such that the container is enclosed in the housing.
  • the space between the container and the housing, through which space air may pass, may be 1-2 mm wide.
  • a method of processing air in a dish washer comprising a washing chamber and a device, the device comprising a drying material arranged in a bed, a heating element arranged in the bed and a fan, the method comprising circulating the air between the washing chamber and the device such that at least part of the air passes through the bed allowing the air to contact the drying material of said bed, withdrawing moisture from the air passing through the bed by means of the drying material, the air passing through the bed at a first mean flow rate, regenerating the drying material by heating the bed by means of the heating element and releasing at least part of the moisture to the air at a second mean flow rate, and altering the fan speed such that the first mean flow rate is higher than the second mean flow rate.
  • the washing chamber 2 and the device 5 provides a circulation of air from the washing chamber 2, into the duct 6 of the device 5, back to the washing chamber 2, and so on, when the device 5 is in use.
  • the drying material 10 arranged in the bed 11 may withdraw moisture from the air 9 passing through the bed 11 during a withdrawal step when the device 5 is in use.
  • the drying material 10 may "dry" the air 9 passing through the duct 6 to the washing chamber 2 such that the air 12, after passing the drying material 10, may be relatively dry.
  • a heating element 13 is arranged in the bed 11, wherein the heating element 13 is arranged to heat the drying material 10 during the regeneration step when the device 5 is in use. By this, moisture may be released from the drying material 10.
  • the heating element 13, depicted in Fig. 1 as a coil, is provided within the bed 11 to generate a uniform heating of the drying material 10 during the regeneration step.
  • the heat from the heating element 11 increases the temperature of the drying material 10 to a relatively high temperature.
  • the drying material 10 may release moisture previously withdrawn from the air 9 by the drying material 10.
  • Fig. 2a shows an option not forming part of the claimed invention wherein the air flow rate through the bed 11 during the withdrawal step is constant and higher than the constant air flow rate during the regeneration step, by altering the fan speed.
  • the mean fan speed is higher than the mean fan speed during the regeneration step.
  • Fig. 2c shows an embodiment of the present invention wherein the fan 14 is operated periodically but wherein the fan speed is increased and decreased gradually.
  • the fan speed may be realized as a saw-tooth function 15, wherein the fan speed is constantly increased to a maximum fan speed and then constantly decreased to a zero fan speed, during the time period t1, and that the fan speed is zero during the time period t2. This operation of the fan speed may be performed again in a cyclic way.
  • the function may be a sinusoidal function 16, for the increase and decrease of the fan speed of the fan 14 during the time period t1, whereas the fan speed is zero during the time period t2. This operation of the fan may be performed again in a cyclic way.
  • a housing 18 at least partly encloses the container 17.
  • the housing 18 comprises an inlet 23 and an outlet 24 arranged for passage of air through the housing 18.
  • the housing 18 may comprise a heat insulating material such as a plastic, thereby further improving the insulation of the device 5 and providing a heat insulation towards the exterior.
  • a space 19 is defined between the container 17 and the housing 18.
  • a small portion of the air 20, which air is circulated by means of the fan 14 may pass in the space 19 around the container 17, whereas a major portion of the air 21 may pass through the container 17 and the drying material 10 in the withdrawal step or regeneration step, when the device 5 is in use.
  • the container 17 is shaped as a parallelepiped and the housing 18 as a somewhat bigger parallelepiped, the container 17 thereby enclosing the housing 18.
  • the space 19 between the container 17 and the housing 18 may be 1-2 mm.
  • the container 17 is shown in a schematic perspective view.
  • the container 17 is shaped as a flat, elongated parallelepiped, wherein the air 21 which is to pass through the container 17 is directed substantially perpendicular to one of the flat surfaces of the container 17.
  • the two sides of the container being perpendicular to the air flow 21, when the device is in use, may comprise e.g. a net 22 of metal wire, whereas the four sides of the container 17 being parallel to the air flow may comprise a Mica mineral.
  • the relative sizes and the positions of the components of the dishwasher 1 and the device 5 could vary, as the figures are meant for a schematic illustration only.
  • any size of the fan 14, the bed 11, the duct 6, or any other component may vary, as the purpose of the figures, to a higher extent than that of depicting relative sizes, is to describe the function of the dishwasher 1. More specifically, the duct 6 may be much thinner, the width of the bed 11 may be smaller, the fan 14 may be bigger, etc.
  • the inlet 7 and the outlet 8 of the duct 6 may be provided at positions other than at the top and at the bottom, respectively, of the washing chamber 2.
  • the inlet 7 may be provided at a lower position than that depicted in Fig. 1 .

Landscapes

  • Drying Of Solid Materials (AREA)
  • Washing And Drying Of Tableware (AREA)
EP10005384.2A 2010-05-24 2010-05-24 Device and method for a dishwasher Not-in-force EP2389854B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PL10005384T PL2389854T3 (pl) 2010-05-24 2010-05-24 Urządzenie i sposób dla zmywarki
EP10005384.2A EP2389854B1 (en) 2010-05-24 2010-05-24 Device and method for a dishwasher
US13/699,236 US9492057B2 (en) 2010-05-24 2011-05-13 Device and method for a dishwasher
PCT/EP2011/057798 WO2011147700A1 (en) 2010-05-24 2011-05-13 Device and method for a dishwasher
CN201180025319.4A CN102905603B (zh) 2010-05-24 2011-05-13 用于洗碟机的设备及方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10005384.2A EP2389854B1 (en) 2010-05-24 2010-05-24 Device and method for a dishwasher

Publications (2)

Publication Number Publication Date
EP2389854A1 EP2389854A1 (en) 2011-11-30
EP2389854B1 true EP2389854B1 (en) 2016-08-24

Family

ID=43014227

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10005384.2A Not-in-force EP2389854B1 (en) 2010-05-24 2010-05-24 Device and method for a dishwasher

Country Status (5)

Country Link
US (1) US9492057B2 (zh)
EP (1) EP2389854B1 (zh)
CN (1) CN102905603B (zh)
PL (1) PL2389854T3 (zh)
WO (1) WO2011147700A1 (zh)

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US10295256B2 (en) 2009-02-04 2019-05-21 Electrolux Home Products, Inc. Dishwasher, a door assembly for the dishwasher, and an associated method for drying dishware
PL2389854T3 (pl) 2010-05-24 2017-02-28 Electrolux Home Products Corporation N.V. Urządzenie i sposób dla zmywarki
EP2389853A1 (en) * 2010-05-24 2011-11-30 Electrolux Home Products Corporation N.V. Sorption drying device for a dishwasher and associated method
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Also Published As

Publication number Publication date
WO2011147700A1 (en) 2011-12-01
US9492057B2 (en) 2016-11-15
EP2389854A1 (en) 2011-11-30
CN102905603A (zh) 2013-01-30
CN102905603B (zh) 2016-01-27
US20130146091A1 (en) 2013-06-13
PL2389854T3 (pl) 2017-02-28

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